/* ===== 万事大吉 - 统一设计系统 ===== */

/* ----- 设计令牌 (Design Tokens) ----- */
:root {
  /* 主色调 */
  --color-primary: #1677ff;
  --color-primary-dark: #0c5bd0;
  --color-primary-light: #1677ff;
  --color-primary-accent: #1677ff;
  --color-primary-bg: #e8f3ff;
  --color-primary-border: #99c1ff;

  /* 中性色 */
  --color-bg: #f5f7fa;
  --color-surface: #ffffff;
  --color-text: #333333;
  --color-text-secondary: #666666;
  --color-text-light: #6b7280;
  --color-border: #e5e7eb;
  --color-border-light: #f0f0f0;

  /* 语义色 */
  --color-success: #00b42a;
  --color-success-bg: #e8ffea;
  --color-warning: #ff7d00;
  --color-warning-bg: #fff7e8;
  --color-danger: #f53f3f;
  --color-danger-bg: #ffece8;

  /* 阴影 */
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 8px 40px rgba(0,0,0,.06);

  /* 圆角 */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  /* 过渡 */
  --transition-fast: .2s cubic-bezier(.4,0,.2,1);
  --transition-smooth: .35s cubic-bezier(.4,0,.2,1);

  /* 字体 */
  --font-sans: 'Inter','Noto Sans SC','Microsoft YaHei','PingFang SC',-apple-system,sans-serif;
  --font-display: 'Noto Serif SC',serif;
}

/* ----- 全局重置 ----- */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 40px 20px;
  line-height: 1.7;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

/* ----- 链接 ----- */
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ----- 按钮 ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  width: 100%;
  padding: .875rem 1.5rem;
  border: none;
  border-radius: var(--radius-sm);
  background: var(--color-primary);
  color: #fff;
  font-family: var(--font-sans);
  font-size: .875rem;
  font-weight: 600;
  letter-spacing: .06em;
  cursor: pointer;
  transition: all var(--transition-fast);
  line-height: 1.5;
  min-height: 2.75rem;
  touch-action: manipulation;
}
.btn:hover { background: var(--color-primary-dark); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.btn:active { transform: translateY(0); }
.btn:focus-visible { outline: 3px solid var(--color-primary-border); outline-offset: 2px; }
.btn:disabled { opacity: .6; cursor: not-allowed; transform: none; }

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  width: 100%;
  padding: .625rem 1.25rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text-secondary);
  font-family: var(--font-sans);
  font-size: .8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: 2.5rem;
  touch-action: manipulation;
}
.btn-secondary:hover { border-color: var(--color-primary); color: var(--color-primary); background: var(--color-primary-bg); }
.btn-secondary:focus-visible { outline: 3px solid var(--color-primary-border); outline-offset: 2px; }

/* ----- 表单控件 ----- */
input, select, textarea {
  font-family: var(--font-sans);
  font-size: .875rem;
  padding: .625rem .75rem;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
  width: 100%;
  line-height: 1.5;
}
input:focus, select:focus, textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(22,119,255,.12);
}
input.error, select.error, textarea.error {
  border-color: var(--color-danger);
  box-shadow: 0 0 0 3px rgba(239,68,68,.12);
}
label { font-size: .8125rem; font-weight: 500; color: var(--color-text-secondary); display: block; margin-bottom: 6px; }
label.required::after { content: ' *'; color: var(--color-danger); }

/* ----- Toast 通知 (替代 alert) ----- */
.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 10000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  padding: 12px 20px;
  border-radius: var(--radius-sm);
  background: var(--color-text);
  color: #fff;
  font-size: .875rem;
  box-shadow: var(--shadow-lg);
  animation: toastIn .3s ease;
  max-width: 360px;
}
.toast.error { background: var(--color-danger); }
.toast.success { background: var(--color-success); }
@keyframes toastIn { from { opacity: 0; transform: translateX(20px); } to { opacity: 1; transform: translateX(0); } }

/* ----- 卡片 ----- */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-fast);
}
.card:hover { box-shadow: var(--shadow-md); }

/* ----- 结果展示区 ----- */
.result-section {
  display: none;
  margin-top: 24px;
  padding: 24px;
  background: var(--color-surface);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
}
.result-section.show { display: block; animation: fadeIn .3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ----- 免责声明 ----- */
.disclaimer {
  margin-top: 16px;
  padding: 12px 16px;
  background: var(--color-bg);
  border-radius: var(--radius-sm);
  font-size: .75rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

/* ----- 外部跳转指示符 ----- */
.nav-external::after {
  content: '\f08e';
  font-family: 'Font Awesome 6 Free';
  font-weight: 900;
  font-size: .625rem;
  margin-left: auto;
  opacity: .4;
  transition: opacity var(--transition-fast);
}
.nav-external:hover::after { opacity: .7; }

/* ----- 响应式 ----- */
@media (max-width: 768px) {
  body { padding: 16px 12px; }
  .card { padding: 20px; }
}

@media (max-width: 480px) {
  body { padding: 12px 8px; }
  .card { padding: 16px; border-radius: var(--radius-sm); }
}